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Low-pressure softened composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane and low-pressure technology, which is applied in the field of water purification, can solve the problems of the reaction monomer solution staying on the membrane, the separation layer of the composite membrane cannot be controlled, and the thickness is difficult to accurately grasp, so as to save the amount of raw materials used and the process is simple. , the effect of improving flux

Pending Publication Date: 2021-12-31
NINGBO FOTILE KITCHEN WARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, the traditional method of preparing nanofiltration membranes is mainly based on interfacial polymerization. When preparing nanofiltration membranes, the water phase monomer and oil phase monomer are usually scraped on the support layer by scraping or dipping. , the separation layer of the composite membrane is prepared through the diffusion of the two-phase reaction monomer in the respective solutions, the concentration of the monomer, and the reaction process. This preparation process determines that an excess of the reaction monomer solution will stay on the membrane, and at the same time , due to the difference in the properties and concentrations of the monomers and the properties of the support layer, the separation layer of the composite membrane prepared in this way cannot be controlled, and the thickness is difficult to accurately grasp
Furthermore, the structure and thickness of nanofiltration membranes prepared by conventional processes are often random and uncontrollable due to the influence of interfacial polymerization reactions.

Method used

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  • Low-pressure softened composite nanofiltration membrane and preparation method thereof
  • Low-pressure softened composite nanofiltration membrane and preparation method thereof
  • Low-pressure softened composite nanofiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Active monomer solution preparation

[0024] Dissolve 0.25% polyethyleneimine PEI 70000 in 99.75% deionized water and stir to make a uniform polyethyleneimine PEI solution with a concentration of 0.25%; in addition, dissolve 0.15% trimesoyl chloride TMC in 99.9% n-hexane to obtain a concentration of 0.15% % trimesoyl chloride TMC solution.

[0025] 2. Electrostatic spray deposition film separation layer

[0026] 1) Immerse the ultrafiltration support layer in the additive 0.1 sodium dodecyl sulfate SDS solution, soak for 10 minutes, take it out and dry it until there is no moisture on the surface;

[0027] 2) Put the above two kinds of active monomer solutions into the two containers of the electrostatic spray equipment respectively, the spray rate on the polyethyleneimine PEI70000 side was fixed at 3.6mL / h, the distance between the needle and the collector was 10cm, and the applied The voltage is +11.2KV, the spray rate of trimesoyl chloride TMC is 3.6mL / h, the di...

Embodiment 2

[0038] 1. Active monomer solution preparation

[0039] Dissolve 0.25% polyethyleneimine PEI 100000 in 99.75% deionized water and stir to make a uniform polyethyleneimine PEI solution with a concentration of 0.25%; in addition, dissolve 0.15% trimesoyl chloride TMC in 99.9% n-hexane to obtain a concentration of 0.15% % trimesoyl chloride TMC solution.

[0040] 2. Electrostatic spray deposition film separation layer

[0041] 1) Immerse the ultrafiltration support layer in the additive 0.1 sodium dodecyl sulfate SDS solution, soak for 10 minutes, take it out and dry it until there is no moisture on the surface;

[0042] 2) Put the above two active monomer solutions into the two containers of the electrostatic spray equipment respectively, the spray rate on the polyethyleneimine PEI100000 side was fixed at 3.6mL / h, the distance between the needle and the collector was 10cm, and the applied The voltage is +12.8KV, the spray rate of trimesoyl chloride TMC is 3.6mL / h, the distance ...

Embodiment 3

[0045] 1. Active monomer solution preparation

[0046] Dissolve 0.25% polyethyleneimine PEI 100000 in 99.75% deionized water and stir to make a uniform polyethyleneimine PEI solution with a concentration of 0.25%; in addition, dissolve 0.15% trimesoyl chloride TMC in 99.9% n-hexane to obtain a concentration of 0.15% % trimesoyl chloride TMC solution.

[0047] 2. Electrostatic spray deposition film separation layer

[0048] 1) Immerse the ultrafiltration support layer in the additive 0.1 sodium dodecyl sulfate SDS solution, soak for 10 minutes, take it out and dry it until there is no moisture on the surface;

[0049] 2) Put the above two active monomer solutions into the two containers of the electrostatic spray equipment respectively, the spray rate on the polyethyleneimine PEI100000 side was fixed at 3.6mL / h, the distance between the needle and the collector was 10cm, and the applied The voltage is +12.8KV, the spray rate of trimesoyl chloride TMC is 3.6mL / h, the distance ...

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Abstract

A low-pressure softened composite nanofiltration membrane comprises a supporting layer and a separation layer stacked on the supporting layer. The supporting layer is an ultrafiltration membrane made of at least one of polyester, polyacrylonitrile, polyvinylidene fluoride, polyether sulfone or polysulfone. The membrane is characterized in that the separation layer is formed by atomizing a water-phase active monomer and an oil-phase active monomer into micro-nano liquid drops in an electrostatic spraying manner, reacting and depositing the micro-nano liquid drops on the supporting layer, the water-phase active monomer is a cationic polyamine, the oil-phase active monomer is an acyl chloride active substance, and an additive is contained in the water-phase active monomer. The invention also discloses a preparation method of the low-pressure softened composite nanofiltration membrane. The problem that a traditional nanofiltration membrane is low in removal rate on hardness ions such as Ca < 2 + > is solved, and meanwhile, the membrane has very high flux and can be used in the fields of household softening, industrial water softening and the like.

Description

technical field [0001] The invention relates to a filter membrane, which belongs to the technical field of water purification, and also relates to a preparation method of the filter membrane. Background technique [0002] Hard water in domestic or industrial applications can reduce household cleaning efficiency due to its high mineral content, cause scaling and corrosion problems, and lead to serious failure of boilers, heat exchangers, and electrical piping. Therefore, in many cases, hard water needs to be softened before it can be used. Water softening is a process of removing hardness ions such as calcium and magnesium ions in hard water. Commonly used methods involve ion exchange resins, zeolite treatment, conventional water softening methods, and water softening by membrane filtration has the potential to reduce operating and by-product disposal costs, increase operational safety, and use less chemical and energy. consume. Now common in reverse osmosis (RO) process, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/12B01D71/34B01D71/42B01D71/48B01D71/68C02F1/44
CPCB01D61/027B01D67/0006B01D69/12B01D71/42B01D71/34B01D71/68B01D71/48C02F1/442
Inventor 裴小强刘丛丛
Owner NINGBO FOTILE KITCHEN WARE CO LTD
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